I actually had the same problem with my 06, so I started to dig into it. I started to take off the knob for the defrost etc. and when I gave it a tug the light came on. I guess the light was just loose or had a bad connection somewhere. Try taking off the knob and start digging into it one piece at a time! Good luck!

oh, can someone point me to a write up on how to get to the lights? Do I have to pull the dash?

I took a flat head screw driver with some electrical tape wrapped and you just pry that panel out (I'd start at the bottom). There is 4 tabs, one on each corner. Once you get one, they all come out pretty easy.